caFactorialDesign: Function caFactorialDesign creates full or fractional...

In conjoint: An Implementation of Conjoint Analysis Method

Description

Function caFactorialDesign creates full or fractional factorial design. Function can return orthogonal factorial design.

Usage

caFactorialDesign(data, type="null", cards=NA, seed=123)

Arguments

data	experiment whose design consists of two or more factors, each with with 2 or more discrete levels
type	type of factorial design (possible values: "full", "fractional", "ca", "aca", "orthogonal"; default value: type="null")
cards	number of experimental runs
seed	seed settings (default value: seed=123)

Author(s)

Andrzej Bak [e-mail],

Tomasz Bartlomowicz [e-mail]

Department of Econometrics and Computer Science, Wroclaw University of Economics, Poland http://keii.ue.wroc.pl/conjoint

References

Bak A., Bartlomowicz T. (2012), Conjoint analysis method and its implementation in conjoint R package, [In:] Pociecha J., Decker R. (Eds.), Data analysis methods and its applications, C.H.Beck, Warszawa, p.239-248.

Bak A. (2009), Analiza Conjoint [Conjoint Analysis], [In:] Walesiak M., Gatnar E. (Eds.), Statystyczna analiza danych z wykorzystaniem programu R [Statistical Data Analysis using R], Wydawnictwo Naukowe PWN, Warszawa, p. 283-317.

Green P.E., Srinivasan V. (1978), Conjoint Analysis in Consumer Research: Issues and Outlook, "Journal of Consumer Research", September, 5, p. 103-123.

SPSS 6.1 Categories (1994), SPSS Inc., Chicago.

See Also

caEncodedDesign and caRecreatedDesign

Examples

#Example 1
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="full")
print(design)
print(cor(caEncodedDesign(design)))

#Example 2
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment)
print(design)
print(cor(caEncodedDesign(design)))

#Example 3
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="orthogonal")
print(design)
print(cor(caEncodedDesign(design)))

#Example 4
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="fractional",cards=16)
print(design)
print(cor(caEncodedDesign(design)))

#Example 5
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="fractional")
print(design)
print(cor(caEncodedDesign(design)))

#Example 6
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="ca")
print(design)
print(cor(caEncodedDesign(design)))

#Example 7
library(conjoint)
experiment<-expand.grid(
price=c("low","medium","high"),
variety=c("black","green","red"),
kind=c("bags","granulated","leafy"),
aroma=c("yes","no"))
design=caFactorialDesign(data=experiment,type="aca")
print(design)
print(cor(caEncodedDesign(design)))

Example output

Warning messages:
1: In rgl.init(initValue, onlyNULL) : RGL: unable to open X11 display
2: 'rgl_init' failed, running with rgl.useNULL = TRUE 
3: .onUnload failed in unloadNamespace() for 'rgl', details:
  call: fun(...)
  error: object 'rgl_quit' not found 
    price variety       kind aroma
1     low   black       bags   yes
2  medium   black       bags   yes
3    high   black       bags   yes
4     low   green       bags   yes
5  medium   green       bags   yes
6    high   green       bags   yes
7     low     red       bags   yes
8  medium     red       bags   yes
9    high     red       bags   yes
10    low   black granulated   yes
11 medium   black granulated   yes
12   high   black granulated   yes
13    low   green granulated   yes
14 medium   green granulated   yes
15   high   green granulated   yes
16    low     red granulated   yes
17 medium     red granulated   yes
18   high     red granulated   yes
19    low   black      leafy   yes
20 medium   black      leafy   yes
21   high   black      leafy   yes
22    low   green      leafy   yes
23 medium   green      leafy   yes
24   high   green      leafy   yes
25    low     red      leafy   yes
26 medium     red      leafy   yes
27   high     red      leafy   yes
28    low   black       bags    no
29 medium   black       bags    no
30   high   black       bags    no
31    low   green       bags    no
32 medium   green       bags    no
33   high   green       bags    no
34    low     red       bags    no
35 medium     red       bags    no
36   high     red       bags    no
37    low   black granulated    no
38 medium   black granulated    no
39   high   black granulated    no
40    low   green granulated    no
41 medium   green granulated    no
42   high   green granulated    no
43    low     red granulated    no
44 medium     red granulated    no
45   high     red granulated    no
46    low   black      leafy    no
47 medium   black      leafy    no
48   high   black      leafy    no
49    low   green      leafy    no
50 medium   green      leafy    no
51   high   green      leafy    no
52    low     red      leafy    no
53 medium     red      leafy    no
54   high     red      leafy    no
        price variety kind aroma
price       1       0    0     0
variety     0       1    0     0
kind        0       0    1     0
aroma       0       0    0     1
    price variety       kind aroma
1     low   black       bags   yes
5  medium   green       bags   yes
7     low     red       bags   yes
12   high   black granulated   yes
17 medium     red granulated   yes
20 medium   black      leafy   yes
24   high   green      leafy   yes
25    low     red      leafy   yes
29 medium   black       bags    no
36   high     red       bags    no
40    low   green granulated    no
46    low   black      leafy    no
53 medium     red      leafy    no
              price variety kind       aroma
price    1.00000000       0    0 -0.04743416
variety  0.00000000       1    0  0.00000000
kind     0.00000000       0    1  0.00000000
aroma   -0.04743416       0    0  1.00000000
    price variety       kind aroma
4     low   green       bags   yes
9    high     red       bags   yes
10    low   black granulated   yes
17 medium     red granulated   yes
21   high   black      leafy   yes
23 medium   green      leafy   yes
29 medium   black       bags    no
42   high   green granulated    no
52    low     red      leafy    no
        price variety kind aroma
price       1       0    0     0
variety     0       1    0     0
kind        0       0    1     0
aroma       0       0    0     1
    price variety       kind aroma
3    high   black       bags   yes
8  medium     red       bags   yes
10    low   black granulated   yes
15   high   green granulated   yes
22    low   green      leafy   yes
23 medium   green      leafy   yes
27   high     red      leafy   yes
31    low   green       bags    no
33   high   green       bags    no
35 medium     red       bags    no
39   high   black granulated    no
41 medium   green granulated    no
43    low     red granulated    no
46    low   black      leafy    no
47 medium   black      leafy    no
54   high     red      leafy    no
              price     variety        kind       aroma
price    1.00000000  0.09561829 -0.09714286 -0.08571429
variety  0.09561829  1.00000000 -0.09561829  0.00000000
kind    -0.09714286 -0.09561829  1.00000000 -0.08571429
aroma   -0.08571429  0.00000000 -0.08571429  1.00000000
    price variety       kind aroma
4     low   green       bags   yes
8  medium     red       bags   yes
15   high   green granulated   yes
17 medium     red granulated   yes
21   high   black      leafy   yes
22    low   green      leafy   yes
29 medium   black       bags    no
33   high   green       bags    no
34    low     red       bags    no
37    low   black granulated    no
41 medium   green granulated    no
50 medium   green      leafy    no
54   high     red      leafy    no
           price   variety        kind       aroma
price   1.000000  0.000000  0.23671604  0.00000000
variety 0.000000  1.000000 -0.11744404 -0.11385501
kind    0.236716 -0.117444  1.00000000 -0.08596024
aroma   0.000000 -0.113855 -0.08596024  1.00000000
    price variety       kind aroma
3    high   black       bags   yes
5  medium   green       bags   yes
16    low     red granulated   yes
24   high   green      leafy   yes
31    low   green       bags    no
36   high     red       bags    no
42   high   green granulated    no
47 medium   black      leafy    no
              price    variety        kind aroma
price    1.00000000 -0.2132007  0.09090909     0
variety -0.21320072  1.0000000 -0.21320072     0
kind     0.09090909 -0.2132007  1.00000000     0
aroma    0.00000000  0.0000000  0.00000000     1
    price variety       kind aroma
1     low   black       bags   yes
5  medium   green       bags   yes
7     low     red       bags   yes
12   high   black granulated   yes
17 medium     red granulated   yes
20 medium   black      leafy   yes
24   high   green      leafy   yes
25    low     red      leafy   yes
29 medium   black       bags    no
36   high     red       bags    no
40    low   green granulated    no
46    low   black      leafy    no
53 medium     red      leafy    no
              price variety kind       aroma
price    1.00000000       0    0 -0.04743416
variety  0.00000000       1    0  0.00000000
kind     0.00000000       0    1  0.00000000
aroma   -0.04743416       0    0  1.00000000

conjoint documentation built on May 1, 2019, 8:05 p.m.